import os

fd = open("/proc/net/dev", "r")
data = fd.read()
fd.close()
data = data.splitlines()


targets = []
                                                                                
for l in data[2:] :
    l = l.strip()
    l = l.replace(":"," ")
    fields = l.split()
                                                                                       
    targ = fields[0]
    targets.append(targ)
    print targets

f = open("/proc/net/arp", "r")
dat = f.read()
f.close()
lines = dat.splitlines()
for l in lines:
       	l = l.strip()
        fields = l.split()
	if (fields[5] == "eth0"):
        	print fields[0]